[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[NH:9][C:10]([NH:12][C:13](=[O:15])[CH3:14])=[S:11].[C:16]([O-])([O-])=O.[K+].[K+].O.CI>CC(C)=O>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[NH:9][C:10](=[N:12][C:13](=[O:15])[CH3:14])[S:11][CH3:16]26.3 g (0.1M) of N-(2,6-dichlorophenyl)-N'-acetylthiourea, 9.9 g (0.06M) of ground 2 K2CO3.3 H2O, 8.3 ml (0.13M) of methyliodide and 200 ml of acetone are put to boil and are energetically shaken for 5 hours. The acetone is distilled off and the residue is washed with water and filtered. The sediment on the filter is washed once or twice more with water. After drying the product is boiled in a reflux with isopropanol 1:6, weight:volume) and is filtered. From the filtrate 22.0 g of N-(2,6-dichloro-phenyl)-N'-acetyl-S-methylisothiourea (79.4% of the theoretical yield), melting point 137° to 140° C. are isolated.
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